On Tue, Oct 26, 2021 at 05:06:21AM +0000, Xu, Min M wrote:
> On October 12, 2021 6:27 PM, Gerd Hoffmann wrote:
> > > + if (ExceptionType == VE_EXCEPTION) {
> > > + EFI_STATUS Status;
> > > + //
> > > + // #VE needs to be handled immediately upon enabling exception
> > > handling
> > > + // and therefore can't use the RegisterCpuInterruptHandler()
> > > interface.
> >
> > Can please you explain in more detail why this is the case?
> >
> VE Exception may happen before a component registers exception.
>
> So it has to be implemented inside the exception lib.
Well, no, you can also change the code to avoid triggering an exception.
Adding a new lib for the exception means the lib must be added into each
and every *.dsc file (either the tdx impl or the null variant), not only
in the tianocore core itself but also all projects depending on tianocore.
So IMHO it is worth checking out how much effort it would be to avoid
early (before component registration) exceptions.
Which early exception do actually happen?
take care,
Gerd
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